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. >>> this year is the worst on record when it comes to west nile virus in the united states and in san francisco they got their first human case of west nile virus in years. ktvu's david stevenson is here now and tells us what the city is pouring down storm drains to deal with this program. david? >> reporter: a program that puts a chemical in the storm drains is aimed at fighting west nile virus. >> reporter: making a special delivery. designed to kill mosquito eggs growing down below. >> we keep a watch over these. the problem is stagnant water in parks. >> reporter: the program is important now, san francisco last week recorded its first case of human west nile virus in 7 years. >> the tip of the ice burg. >> reporter: officials last week found one that tested positive for the virus. mosquito transmit the virus from birds to human. there are more san franciscans infected than they are aware of. >> only 1-5 will develop a illness and 1-150 will develop the severe encephalitis. >>> the u.s. is experiencing the largest outbreak of west nile virus since 13 years ago. as of yesterday there are 16
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